Okay..I just bought a pair of the cutest (last pair) flats online...They came in the mail and fell in love with them, however when I tried them on, they are half a size small!!!! I love the shoes soo much, but I know when I walk in them im going to be dying because they are a bit tight...

I can't exchange them, because they were literally the last size, and I dont want to!!

If it's a really expensive pair of shoe I would take it to a shoe repair place but otherwise you can try this at home for a quick solution:
Take a ziploc sandwich bag and fill it with some water. Then put it inside the shoe, making sure it fits perfectly in the area you want to stretch. Then put it in the freezer. When the water turns to ice, it expands the shoe a bit, making them a lot more comfortable to wear.